1、Introduction to materials
Bluestone is a kind of gray or gray white sedimentary rock (about 15% of the lithosphere) which is widely distributed in the earth's crust. It is an important component of carbonate rocks. Bluestone is widely used in living room, dining table, tabletop or cabinet counter after being cut into plates by stonemasons from deep mountains. Compared with natural marble, the advantage of bluestone is that its main component is calcium carbonate, which is pollution-free and radiation-free; bluestone is also an ideal material for construction industry, which is widely used in highway, railway, construction sand and other fields.